Tension device



July 20, 1948. i C. Q BRUESTLE 2,445,600

TENSIQN DEVICE Filed Dec. 28, 1944 3 Sheets-Sheet 1 l MUNI] `Fuly 20, 1948.

Filed Dec. 28, 1944 C. O. BRUESTLE 4TENSION DEVICE 3 Sheets-Shea t 2 July 20, 1948. c. o. BRUESTLE TENSION DEVICE 5 sheets-sheet 5 Filed DGO. 28, 1944 REN.

3 .U: sw www muv L m ,NNQ ww f ,w n 7 e UE ha J I 7 a uw C IJ www J 1W- T QN www Patented July 20, 1948 TENSION DEVICE Carl 0. Bruestle, Rahway, N. J., assignor to Borg- Warner Corporation, Chicago, Ill., a corporation of Illinois Application December 28, 1944, Serial N'o. 570,076

14 Claims. l

This invention relates generally to weaving 4machines, but it is more specically directed'to improvements in machines for weaving screen cloth of metal orother material and particularly a screen cloth characterized by ribbon-like wefts that function as louvers, when the screen is in use, to exclude direct sunlight.

After the woven screen is advanced or delivered from the Weaving head it is preferably wound in a continuous length in the form of a bundle on a suitable core. The delivery ci the cloth from `the weaving head is characterized by its intermittent movement. In the prcsentarrangement provision is made to wind the woven screen by intermittently rotating the bundle winding core,

4and synchronize this step-by-step movement with that of the delivery ofthe screen from the weaving instrumentalities. Also provision is made for maintaining the cloth under tension to hold it taut between the delivery and winding devices thereby to eliminate slack in the screen and also to prevent distortion or damage' tothe ribbon-like weft strands that comprise the louvers of thev woven screen.

It is one of the principal objects of this invention to simplify the construction of a Vscreen Weaving machine such as contemplated herein and to improve the efficiency, operation and dependability of such weaving machine.

ation of the winding mechanism. In this connection the construction and arrangement of the tensioning means is such as to effect a slippage in the event sudden jerks occur during the feed of the screen cloth to the winding core.

Still another object is to provide a weaving deviceior producing a screen cloth having ribbonvlike weit members, said weaving devicehaving a positive take-off and provision for rolling the (Cl. V1740-36) woven screen onto a winding core while maintaining proper predetermined tension on the screen to keep it taut between the take-off and the core, thereby to prevent damage to the ribbon-like weft member.

Additional objects, aims and advantages of the invention contemplated herein will be apparent to persons skilled in the art after the construction and operation of the tensioning device is understood from the within description. It is preferred to accomplish the numerous objects of this invention and to practice the same in substantially the manner hereinafter fully described and as more particularly pointed out in the claims. Reference is now made to the accompanying drawings that form a part of this specification, wherein:

Fig. 1 is a fro'nt elevation of portions of a screen lweaving machine showing the present improvements incorporated thereon;

Fig. 1A is a View in perspective showing a fragmentary portion of a screen cloth produced by a weaving machine ofthe character disclosed here- 1n; Fig. 2 is a composite vertical section taken along the planes of lines 2-2 and 2lb-2a on Fig. l;

Fig. 3 is a vertical section taken along the plane f of line 3-3 on Fig. 2, with parts enlarged and the shaft foreshortened;

Fig. 4 is a horizontal fragmentary section along the plane of line 4-4 on Fig. 2, looking down in `the direction of the arrows;

Fig. 5 is a vertical elevation viewed on the plane of line 5-5 on Fig. 3; and

Fig. 6 is a fragmentary horizontal section taken along the plane of line 6 6 on Fig. 1.

The drawings are to be understood as being `more or less of a schematic character for the purpose of disclosing a typical or preferred yform of the improvements contemplated herein, and in these drawings like reference characters identify the same p arts in the different views.

In the Weaving machine shown in Fig. 2, the

weaving head at the left-hand portion thereof is a section on line 2a-2a of Fig. 1. Said weaving head comprises the xed frame I0 having the shelf l2 and the base I4 supported on a standard I0;` the comb assembly I8 on said shelf; and suitable driving means exemplied by the rotatable shaft 20. The quill assembly 22 that is carried by :i shelf I2 is operated by a longitudinally reciprocable horizontal rack 24 which in turn is driven by a rocker arm 2B fulcrumed on the shelf and oscillated by a suitable cam device (not shown) which is keyed to the shaft 20.

The comb assembly I8 is supported on the upper portion of a swinging frame that comprises the upstanding longitudinal wall 28 and irregularly shaped lateral webs 30 having fulcrums on an axle 32 that passes through these webs for journaling the frame for swinging movement as seen in Fig. 2. The comb assembly comprises generally ar vertically movable slide member 34 mounted in ways or guides 36 on wall 28V and carries on its upper portion the front comb 38 yieldingly urged toward and against the back comb 40 which is carried in -a seat 42 on wall 28. Thus the front comb 38 rides on the backv comb 40 and it is movable up anddown. with respect thereto by reaso-n of the verticalmovement. of the slide 34. A'roller 44 on the adjacent end of" an arm 4S operates in a recess 45 in the slide to move the latter, said arm'being fulcrnmed on a pivot 43 beneath the shelf I2. of arm 46 carries a roller 50 riding on an edge cam 52 having a land 54 and keyed to the driving'shaft 20.

A roller. 3 3' carried on the back portions of the frame webs 30' rides on an edge cam S5 onl shaft alongside the cam 52, which maybe identical with cam 52 and having a landy 35a, thus eiecting; the swinging movement of the supporting frame for intermittently shifting the back comb 40 away from the quills in a horizontal direction to predetermine the spacing` ofthe weft strands and'for advancing the woven screen to the takeoff andwinding devices.

The web or woven fabric produced by the anacliine is preferably a metal cloth or mesh A which, as shown in perspective in Fig. 1A, comprises spacedl ribbon-like weft elements a around which warp wires b areV tied or twisted for maintaining the. ribbon-like weft elements in their desired spaced relation. This arrangement provides an insect screen. capable of substantially excluding passage therethrough of direct sun rays. After the front combV 38 has moved down to clear' the mesh, the back comb 40 moves away from the quills 22 While engaged. with the last inserted weitelement a and draws with it the warp strands sufficiently to properly space the next weft element. The combsare then returned totheir. operativeposition for thensertion of the next weft element. It will be seen that the delivery of the Woven mesh from the weaving head is. intermittent..

The woven screen` is advanced tothe take-oft device where it. is trained onto an elongated roller 5S, then between this.r roller and an opposing roller 58., and thereafter the screen is Wound in a bundle on a core 60 to which its leading endis suitably attached. The rollers 56 and 58,.which are. arranged insuperposed relation, are made of softinaterial to prevent damaging thescreen, and as seen in Fig. 1 the trunnions of thesev rollers have meshed gears 6.2v and 64 securedtov them the upper gears rbeing provided with sprockets 66 upon. which chains 68 and l0 are trained. The chain 'lil is engaged. with idle sprocket. 12. that directs said chain to sprocket 'I4 for driving the core4 S0 of the fabric bundle, and chain` 68 isengaged with a sprocket I6 at the-adjacent end-of a horizontal shaft i8. A sprocket 80 onr the other end of shaft 'I8 is engaged by chain 'l0 as seenin .Fia 2.

The other. end

The winding core 60 preferably is tubular and its end nearest sprocket IB is carried on a plunger-like trunnion 82 the shank of which is slidably mounted in a socket having a dou-ble bayonet slot 84 to receive and releasably retain a lateral pin 86 projecting from said trunnion for holding it in retracted or projected positions. By retracting the trunnion 82 its head is removed from the tubular core to facilitate dismounting the bundle as well as ready replacement of a core.

The other end of core 00 is carried on a headed plunger-like trunnion 88 that is rotatable and is arranged for yielding axialmovement. As shown in Fig. 6, the trunnion 88 is journaled in antifriction devices 90 and 9| and has a ange 92 against which a washer 94 is pressed by a spring 96 that is interposed between said washer and thai-lange 98 of a slip collar |00 keyed on trunnion 815 to rotate therewith and for longitudinal movement. thereon. Sprocket "I4, which is preferably'loose on trunnion 88, has a flange |02 opposing collar flange 98 and there is a friction disc I lili' interposed between the confronting faces of these opposed anges 98 and |02. An elongated spacer |05 surrounds trunnion 88 between the outer anti-friction device 90 4and a ball-bearing unit' I 08 alongsidev sprocket 14. This arrangement creates suflicient drag or braking action for the. sprocket to rotate the trunnion 88 for winding the wire mesh on the core. lThe sprocket is rotated at a definite speed and' as the bundle increases in diameter the peripheral speedlof` the outer convolution of thebundle is'faster in lineal feet per minute than the peripheral speed of the core surface, so that the differential in speed gradually increases the. pull' upon the woven screen between the take-off vand the bundle. This condition 'automatically' equalizes because increase of pull on thescreen will cause slippage 4between the frictionally engaged parts of' this assembly. Also the arrangement takes care of and absorbs any sudden jerk or. jar that may be incidental to the intermittent movement of the screen during the take-ofi' and winding thereof'.

The shaft I8 is preferably comprised of a plurality of. sections that are coupled .by one-way clutches |08. and |09 with the end sections of the shaft journaled in bearings IIO so that the end regions thereof project beyond said bearings as shown. in Fig. 3. The hub of' sprocket. 16, which islloose. on shaftA `I8,' has a widedisclike flange I.I 2, and a shouldered collar'I I4 isattached by a lock-screw I|6 to the shaft alongside said ange for rotation withv the. shaft. Driving connection betweencollar I I4 and hub ilange II2 is effected` by a suitable clock spring IIB. The outer coil of this springis looped.' around a pin |270.V projecting.laterallyW from the marginal portion of. the hub, flange and the innerV coil of spring I'I8. islbent. into a radial slot |22 in the reduced portionof collar IM' as seen in Figs. 3 and5. The hub of the other sprocket 80 is loose on the adjacent end section of shaft 18 and has a disc-likey ange |24'. to; which .the outer coil of a-c1ockspring |26 is attached by a pin |28. The inner coil of. this second spring (not shown) is attached tothe reduced portion of the. shouldered vcollar |30. that is anchored to shaft 'I8 .by a lock pin. |32, thusproviding a drivingA connection between shaft .'I8.and the sprocket 80.

The shaftfl, is intermittently rotated in synchronized relation. with respect to movement of back comb. 40.. away. from., the quill. head' when. it drawsthe warp. through the quills and advances the nished web A: toward take-off roller 56. To

accomplish this, one of the members` of one-way clutch |09 is secured to shaft 18 and the other member which is adapted for reciprocatory rotative movement with respect thereto is connected to a radially projecting arm |34. A pitman bar |36 is fulcrumed for swinging movement on a pivot |38 on arm |34 (Fig. 3) and Vextends upwardly in an inclined direc-tion (Fig. 2) Vwith its upper end carried upon a crank pin |40 on the exterior of a plate |42 that is bolted to the end of the hollow hub |44 of a gear |46 as shown in Fig. 4. This gear |46 is meshed with a pinion |48 on the adjacent end of shaft 2l! so that it is intermittently rotated thereby to turn thecrank pin |40. A headed spindle |50, attached to and projecting from the boss |52 of a suitable bracket |54, extends through ,the gear hub |44, and antifriction devices |5'6 interposed between the hub and spindle provide -a journal for gear |46. The pivot pin |38 on arm |34 for the lower end of pitman bar |36 is preferably carried by a slide block (not shown) that Vis adapted for adjustment by a hand wheel |58 in directions longitudinally of arm |34 or radially with respect to shaft 10, thus selectively predetermining the amount of swing that is imparted to arm |34 by pitman b-ar |36 and the intermittent rotation of shaft 18.

An indicating device, shown at the right hand end of Fig. 3, and detailed in Fig. 5, is employed in order that the operator may Vreadily ascertain whether or not a constant tension is being maintained during the weaving `of the screen. This device comprises a pointer |60 projecting radially from the end of shaft 18 for cooperation at its outer end with an L-shaped member |62 anchored to the adjacent portion of the disc-like flange H2. Pointer |60, which preferably has a Z-shape, is adjustably attached to the end of shaft 18 .by a suitable clamping screw |64 to permit resetting of the pointer for cooperation with member |62 after tension has been adjusted prepara-tory to starting the machine. Desired tension is attained by uncoupling ypirtman bar |36 from pivot `|38 and then reciprocating the radial arm 34 until spring IIB is under the required tension,

after which pitman bar |316 is recoupled and a final adjustment may be made through hand wheel |53. The pointer |60 is then adjusted to a .position alongside its cooperating fixed member |62. Y

When the weaving machine is operating, the weaving is quite rapid and the outward movement of the back comb 40 away from the quills 22 of the weaving head and its return to the head may require only a fractional portion of a second of time, so this reciprocatory motion is of a rapid vibratory character. During. each vibratory movement of the back comb, the take-off and winding assemblies have each been advanced a small segment of a rotation the lineal :dimension of which corresponds to the distance the back comb has traveled away from the weaving head to space the ribbon-like weft strands. This vibratory action of .the back comb and the rapid intermittent actuation of the take-off and winding assemblies, would -ordinarily create either slack in the woven screen or too much pull thereon both of which, it has been found, tend to mar the screen. The'present arrangement prevents either of these contingencies arising and is effective constantly in maintaining predetermined tension to avoid injury to the woven screen.

While this invention has been described in detail in its present preferred form or embodiment, it willbe apparent to persons skilled in the art,

6 after understanding .the improvements, thatvarious changes and modifications may be made .therein without departing from the spirit or scope thereof. It is aimed in the appended claims to cover all such changes and modifications.

I claim:

1. In a Weaving device having a weaving head for producing woven screen cloth with ribbon-- like weft members; the improvement of means for rolling the woven screen onto a winding core and maintaining proper preselected tension on the Woven screen, said means comprising in combination, a winding core; take-olf means-receiving the screen delivered from said weaving head, the screen being fastened to said core; a driven shaft; sprockets on said driven shaft, said takeoff means, and said core; means comprising a chain driving said sprockets in synchronis'm; friction clutch means providing a driving connecton between said core and the sprocket thereon, said clutch meansalso effecting slippage during overdrive of said sprocket; and yieldable tension means providing a driving connection between said driven shaft and the sprocket thereon.

2,. In a weaving device having a weaving head for producing woven screen cloth with ribbonlike weft members; the improvement of means for rolling the woven screen onto a winding core and maintaining proper preselected tension on the woven screen, said means comprising in combination, a winding core; a take-.off roll receiving the woven screen delivered from said weaving head, the screen being fastened to 'said core; a driven shaft; a one-way drive clutch on said shaft; means for operating said clutch to impart intermittent rotation to said shaft; -a sprocket loose on said shaft; tension means effecting a yieldable driving connection between said shaft and the sprocket thereon; sprockets onY take-off roll, and said core; means 4comprising a. chain driving all of said sprockets in synchronism; and friction clutch means providing a driving connection between said core and the sprocket thereon and adapted to eifect slippage during any overdrive of said sprocket.

3. In a weaving machine having a weaving head for producing a screen, a comb adapted Vfor reciprocable movement away from the weaving head to longitudinally advance the screen a distance for effecting the spacing of the weft strands of the screen; take-off means comprising take-off rollers for withdrawing' the screen from said comb; a rotatable core for winding the screen; and common driving means for actuating said comb and for rotating said rollers and core, said driving means includingV a frictional slip device whereby said driving means is effective to wind a length of screen on said core that is at least approximately equal to thelength of screen advanced away from the weaving head by said comb.

4. In a weaving machine having a Weaving head for producing a woven screen, a` movable comb assembly including a comb and a reciprocablev support for moving the comb to longitudinally advance the screenV away from the weaving head a distance for predetermining the spacing of the weft strands of the screemtakeoff means comprising take-off rollers for withdrawing the screen from said comb; a rotatable screen bundle winding core for receiving the screen Withdrawn by said rollers; and common driving means for actuating said comb assembly and for rotating Said rollers and core, said driving means including a frictional slip device wherebyv said driving means is effective to wind a length of screen on said core that approximates tothe length of screen advanced by said comb assembly and to maintain in a taut conditionthe -portion of the screen between the bundle and the weaving head. g

' 5. In a weaving device having a weaving head for producing woven screen cloth, the improvement of means for rolling the woven screen onto a- Winding core and maintaining proper tension on the woven screen, said means comprising a reciprocable comb coacting with the weaving head and movable to advance the woven screen away from said weaving head; take-olf means receiving the woven screen advanced by said comb; a rotatable core for winding the woven screenfrom said take-olf means; and common driving means for rotating said take-off means and core and for actuating said comb, said lastmentioned means including a frictional slip def vice whereby said means is effective for maintaining the woven screen under tension between said comb and said core.

6. In a weaving device having a weaving head for producing woven screen-cloth having ribbcn-like weft members; the improvement of means for rolling the woven screen onto a winding core and maintaining proper preselected tension on the woven screen, said means comprising in combination, a winding core; opposingtake-off rolls receiving thewoven screen delivered from said weaving head, the screen being threaded through said take-off rolls andfastened to saidcore; a driven shaft; driving means on saidtake-off rolls, and said core, said driving-means having operative connection with and actuated by said driven shaft; endless means for rotating all of saidr driving means in synchronism; means for intermittently rotating said drivenv shaft whereby to transmit intermittent motion through said endless means to said takeoff rolls and said core, and yieldable tension means providing a driving connection between driven-shaft and the driving means thereon.v

7. In a machine for weaving a screen having louver-like weft strands, a comb support; means for reciprocating said support in a direction to movefthe screen away from the weaving head of the machine; a take-off winding assembly including a rotatable core for winding the screen; and common driving means for rotating said take-off winding means and for actuating said support reciprocating means, the construction andarrangement of said common driving means being such that the screen is maintained under constant tension between said comb support and saidicore.

8. In a machine for weaving a screen having louver-like weft strands, said machine having a weaving head including a vibratory comb member; a take-off roller; actuator means for effecting-said vibration of the comb member to advance the woven screen to said take-off roller, a rotatable core for winding the screen from said take-offroller; and means for driving said takeoiI roller and core from said comb actuator means, said driving means including driven members individual to and drivingly connecting said roller and core for simultaneous rotation; a friction clutch assembly effecting an operative connection between said core and the driven member individual thereto; and a driven shaft rotated by said actuator means, said shaft having .driving connection with the individual driven members forsaid-take-oiii4 rollerrandsaid core.

9. Ina machine for weaving a screen as defined in yclaim 8, wherein the driving means includes one-way clutch means interposed between the driven shaft and the actuator means for effecting intermittent rotation of the driven shaft, the take-off roller and the core.

10. In a weaving machine having a weaving headfor producing a Woven screen with ribbon, like weft members, the said head including a vibratory comb adapted to advance the Woven screen away from the head, a continuously rotatable driving shaft; a support for the comb fulcrumed for vibratory movement; cam means on said driving shaft for effecting the aforesaid vibratory movement of said support; a countershaft; a one-way clutch device one member of which is anchored to said countershaft; a crank element continuously rotated by said driving shaft; a pitman operatively connecting said crank element and the other one-way clutch member for effecting intermittent rotation of said Icoun-- tershaft; roller means constituting a take-off for the. woven screen advanced from thel weaving head; a core for winding the woven screen received from said take-off; and devices eiecting avdriving connection between said countershaft, said take-off rollers, and said core.

11; A weaving machine arrangement asv deiined in claim 10 Ywherein the devices for effecting a driving connection between the countershaft, the take-off and the core comprise a chain; sprockets on the shaft, the take-off and the core: and means effective for maintaining predetermined tension on the woven screen between the weaving head and the winding core.

12. A weaving machine arrangement as defined in claim 10 wherein the devices for effecting a driving connection between the countershaft, the take-oir and the core comprise rotatable members individual the countershaft, the take-off and the core; an endless element drivingly engaged with said individual members for simultaneously rotating the members on said take-off andsaid core in synchronized relationvto the member individual to the counters-haft; and yieldable means interposed between and operatively connecting the countershaft to the rotatable member individual thereto.

1,3. In a weaving device, a weaving head. for producing woven screen cloth with ribbonlike weft members; means for rolling the woven screen on a winding core and maintaining proper preselected tension on the woven screen, said means comprising in combination, a winding core; a plurality of take-off rolls for withdrawing the screen from the weavingvhead and advancing the screen to said core; a rotatable shaft; driving means operatively connecting said core and takeoff` rolls yto said shaft; friction clutch means connecting said core and driving means for effecting a slip driving connection for said core; and tension creating means between said shaft andthe means for driving said core.

14. In a weaving device having va weaving head for producing woven screen-cloth with ribbonlike/weft strands; said head having a reciprocable comb; the improvement of means for rolling the ywoven screen onto a winding core, and maintaining proper preselected tension on the woven screen, said means comprising in combination, a winding core; opposed take-o1f rolls forl withdrawing the woven screen from said weavinghead and advancing the screen to said core; a rotatable shaft; sprocketson said shaft, saidtake-off rolls and said core; chain means-driven by said CARL O. BRUESTLE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,472,988 Norris et al. 1 Nov. 6, 1923 1,807,726 Brickman 1 June 2, 1931 2,223,317 Ewing Nov. 26, 1940 2,244,511 Berg June 3, 1941 2,363,415 Harter 1.41-1111 Nov. 21, 1944 

